The word doing the work: “enforce”

Read subsection (1) once more. The prohibition carries three verbs — add, amend, enforce — while the consent clause refers only to “such addition or amendment.” An association whose ADU ban was recorded decades ago and never touched since has neither added nor amended anything. The statute still says it may not enforce that covenant.

Law-firm commentary has put the resulting question squarely: whether a covenant recorded before 1 July 2026 survives.⁴ No Idaho court has construed the amended section.

What is not speculative is where an Idaho court would begin. The sibling provision on rentals, § 55-3211, is built from nearly the same sentence — “add, amend, or enforce any covenant, condition, or restriction in such a way that limits or prohibits… unless expressly agreed to in writing.” On 6 January 2026 the Idaho Supreme Court construed that sentence in North Henry's Lake Homeowners Association v. Norton, held it unambiguous, and held that a restriction adopted without the affected owner's written consent never encumbered the property and could not be enforced against that owner or any successor. “[T]here is nothing in the plain language of the statute that creates a temporal limitation,” the Court said.⁵

The two sections are not identical — § 55-3211's consent clause says “at the time of such addition or amendment,” and § 55-3212's does not — and the Supreme Court has spoken to only one of them. But an association treating the ADU provision as reaching future amendments alone is taking a reading of nearly identical language that the Court declined to take three months before this amendment took effect.

The cross-reference that no longer lands

There is a loose end worth knowing about. Idaho Code § 55-618, added in 2023 and not amended in 2026, declares void any restrictive covenant entered into on or after 1 July 2023 that prohibits “an internal accessory dwelling unit, as defined in section 55-3212, Idaho Code” — and makes anyone attempting to create or enforce such a covenant liable for attorney's fees, court costs and damages.⁶

Section 55-3212 no longer contains that definition. The act's own title records the change: “to revise provisions regarding accessory dwelling units and to remove a definition.”³ That leaves a fee-shifting statute pointing at a definition that was deleted. This column treats it as a story in its own right.

What boards and managers can be doing now

1. Find the ADU language in your declaration. It is rarely labelled. Look for single-family-use clauses, one-dwelling-per-lot clauses, second-kitchen restrictions, guest-house limits and occupancy caps — any of which can operate as a prohibition.
2. Stop relying on a categorical denial. A denial resting on a blanket covenant ban is the exposure this amendment creates. A denial resting on a subsection (2) rule sits on ground the Legislature expressly preserved.
3. Write those rules if you do not have them. Associations that relied on a flat prohibition frequently never adopted dimensional standards, and now have nothing to apply. Subsection (2) authority is real, but only if exercised.
4. Anchor design review to the primary dwelling. The amendment ties architectural authority to consistency with the primary dwelling — a narrower hook than general aesthetic discretion.
5. Keep rentals in their own lane. Subsection (4) puts § 63-1803(4) rentals outside this section, and rental restrictions run under § 55-3211.

What to watch next

Three things. The first Idaho appellate decision construing amended § 55-3212, particularly on covenants predating July 2026 — there is none yet. The 1 February 2027 deadline in § 67-6541, after which cities over 10,000 must permit an accessory unit per single-family lot on an administrative, as-of-right basis. And whether the 2027 Legislature returns to the subject: the broader 2026 bill, SB 1277, died in committee, and the version that passed was narrowed by amendment before it did.⁷